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   <div id="projectname">Reranker Framework (ReFr)
   
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   <div id="projectbrief">Reranking framework for structure prediction and discriminative language modeling</div>
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<div class="title">abstract-file-backed-feature-extractor.H</div>  </div>
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<a href="abstract-file-backed-feature-extractor_8_h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2012, Google Inc.</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// </span>
<a name="l00004"></a>00004 <span class="comment">// Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment">// modification, are permitted provided that the following conditions are</span>
<a name="l00006"></a>00006 <span class="comment">// met:</span>
<a name="l00007"></a>00007 <span class="comment">// </span>
<a name="l00008"></a>00008 <span class="comment">//   * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment">//     notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment">//   * Redistributions in binary form must reproduce the above</span>
<a name="l00011"></a>00011 <span class="comment">//     copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00012"></a>00012 <span class="comment">//     in the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment">//     distribution.</span>
<a name="l00014"></a>00014 <span class="comment">//   * Neither the name of Google Inc. nor the names of its</span>
<a name="l00015"></a>00015 <span class="comment">//     contributors may be used to endorse or promote products derived from</span>
<a name="l00016"></a>00016 <span class="comment">//     this software without specific prior written permission.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00019"></a>00019 <span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00020"></a>00020 <span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00021"></a>00021 <span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00022"></a>00022 <span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00023"></a>00023 <span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           </span>
<a name="l00025"></a>00025 <span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           </span>
<a name="l00026"></a>00026 <span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00027"></a>00027 <span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00028"></a>00028 <span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00029"></a>00029 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00037"></a>00037 <span class="comment"></span>
<a name="l00038"></a>00038 <span class="preprocessor">#ifndef RERANKER_ABSTRACT_FILE_BACKED_FEATURE_EXTRACTOR_H_</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span><span class="preprocessor">#define RERANKER_ABSTRACT_FILE_BACKED_FEATURE_EXTRACTOR_H_</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a>00041 <span class="preprocessor">#include &lt;iostream&gt;</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include &lt;fstream&gt;</span>
<a name="l00043"></a>00043 
<a name="l00044"></a>00044 <span class="preprocessor">#include &quot;<a class="code" href="tokenizer_8_h.html" title="Provides the Tokenizer  class.">tokenizer.H</a>&quot;</span>
<a name="l00045"></a>00045 <span class="preprocessor">#include &quot;<a class="code" href="feature-extractor_8_h.html" title="Provides the reranker::FeatureExtractor interface.">feature-extractor.H</a>&quot;</span>
<a name="l00046"></a>00046 
<a name="l00047"></a><a class="code" href="namespacereranker.html">00047</a> <span class="keyword">namespace </span>reranker {
<a name="l00048"></a>00048 
<a name="l00049"></a>00049 <span class="keyword">using</span> std::cout;
<a name="l00050"></a>00050 <span class="keyword">using</span> std::istream;
<a name="l00051"></a>00051 <span class="keyword">using</span> std::ifstream;
<a name="l00052"></a>00052 
<a name="l00057"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html">00057</a> <span class="keyword">class </span><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html" title="This class makes it easy for concrete subclasses to extract features based on input from a file...">AbstractFileBackedFeatureExtractor</a> : <span class="keyword">public</span> <a class="code" href="classreranker_1_1_feature_extractor.html" title="An abstract base class/interface for all feature extractors.">FeatureExtractor</a> {
<a name="l00058"></a>00058  <span class="keyword">public</span>:
<a name="l00060"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ae1a8ca499ceccbd96e595c5eed8162e5">00060</a>   <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ae1a8ca499ceccbd96e595c5eed8162e5" title="Constructs an instance.">AbstractFileBackedFeatureExtractor</a>() : <a class="code" href="classreranker_1_1_feature_extractor.html" title="An abstract base class/interface for all feature extractors.">FeatureExtractor</a>(), <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>(NULL) {
<a name="l00061"></a>00061   }
<a name="l00063"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#aabac653d0cbf2bcb372622919fdfa1ec">00063</a>   <span class="keyword">virtual</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#aabac653d0cbf2bcb372622919fdfa1ec" title="Destroys this instance.">~AbstractFileBackedFeatureExtractor</a>() {
<a name="l00064"></a>00064     <span class="keyword">delete</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>;
<a name="l00065"></a>00065   }
<a name="l00066"></a>00066 
<a name="l00086"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a55f7c8c8ed682a6c5dfe8ee16f0657d1">00086</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a55f7c8c8ed682a6c5dfe8ee16f0657d1" title="Registers the data member to be initialized when an instance of this class is constructed by a Factor...">RegisterInitializers</a>(<a class="code" href="classreranker_1_1_initializers.html" title="A container for all the member initializers for a particular Factory-constructible instance...">Initializers</a> &amp;initializers) {
<a name="l00087"></a>00087     <span class="keywordtype">bool</span> required = <span class="keyword">true</span>;
<a name="l00088"></a>00088     initializers.<a class="code" href="classreranker_1_1_initializers.html#a9554990729db9c5d1b85925fc3c42d91">Add</a>(<span class="stringliteral">&quot;filename&quot;</span>, &amp;<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ab1c642c4cc69753a5560aaf9a147750f" title="The name of the file backing this feature extractor.">filename_</a>, required);
<a name="l00089"></a>00089   }
<a name="l00090"></a>00090 
<a name="l00098"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a8f10510be662115b0452f860285c0cde">00098</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a8f10510be662115b0452f860285c0cde" title="This method is guaranteed to be inokved by a Factory after invoking the RegisterInitializers method j...">Init</a>(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;arg) {
<a name="l00099"></a>00099     <span class="keyword">delete</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>;
<a name="l00100"></a>00100     <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a> = <span class="keyword">new</span> ifstream(<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ab1c642c4cc69753a5560aaf9a147750f" title="The name of the file backing this feature extractor.">filename_</a>.c_str());    
<a name="l00101"></a>00101   }
<a name="l00102"></a>00102 
<a name="l00104"></a>00104   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a6c6d31af782109224da56bee01316523">Extract</a>(<a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;candidate,
<a name="l00105"></a>00105                        <a class="code" href="classreranker_1_1_feature_vector.html">FeatureVector&lt;int,double&gt;</a> &amp;features) = 0;
<a name="l00106"></a>00106 
<a name="l00108"></a>00108   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#afdbfa39e53be2006eebea77d5d1cc640">ExtractSymbolic</a>(<a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;candidate,
<a name="l00109"></a>00109                                <a class="code" href="classreranker_1_1_feature_vector.html">FeatureVector&lt;string,double&gt;</a> &amp;symbolic_features)
<a name="l00110"></a>00110   = 0;
<a name="l00111"></a>00111 
<a name="l00112"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#aa156423a870877982dd9ceea36e0be54">00112</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#aa156423a870877982dd9ceea36e0be54" title="Indicates to this instance that iteration over candidate sets on which features are being extracted h...">Reset</a>() {
<a name="l00113"></a>00113     <span class="keyword">delete</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>;
<a name="l00114"></a>00114     <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a> = <span class="keyword">new</span> ifstream(<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ab1c642c4cc69753a5560aaf9a147750f" title="The name of the file backing this feature extractor.">filename_</a>.c_str());    
<a name="l00115"></a>00115   }
<a name="l00116"></a>00116 
<a name="l00117"></a>00117 
<a name="l00126"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#af0993c4d905f72381d188dd6322d4a3d">00126</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#af0993c4d905f72381d188dd6322d4a3d" title="Extracts features for all the candidates in the specified CandidateSet.">Extract</a>(<a class="code" href="classreranker_1_1_candidate_set.html" title="A class to hold a set of candidates, either for training or test.">CandidateSet</a> &amp;candidate_set) {
<a name="l00127"></a>00127     <span class="keywordflow">for</span> (<a class="code" href="classreranker_1_1_candidate_set.html#a466bf9e9ff2852608e9e702f7182bb81">CandidateSet::iterator</a> it = candidate_set.<a class="code" href="classreranker_1_1_candidate_set.html#a2a6e17ba0eff32f7c48435c9456c7fe7">begin</a>();
<a name="l00128"></a>00128          it != candidate_set.<a class="code" href="classreranker_1_1_candidate_set.html#aab273fd7ef076bc5221e0d099c38b8aa">end</a>();
<a name="l00129"></a>00129          ++it) {
<a name="l00130"></a>00130       <a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;candidate = *(*it);
<a name="l00131"></a>00131       <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ae2290c8c1b9dc467661285b553a4a6fd" title="Reads from the stream.">ReadFromStream</a>();
<a name="l00132"></a>00132       <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a6c6d31af782109224da56bee01316523">Extract</a>(candidate, candidate.mutable_features());
<a name="l00133"></a>00133       <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#afdbfa39e53be2006eebea77d5d1cc640">ExtractSymbolic</a>(candidate, candidate.mutable_symbolic_features());
<a name="l00134"></a>00134     }
<a name="l00135"></a>00135   }
<a name="l00136"></a>00136 
<a name="l00139"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a885a1ac08d8da3701b6190ab5b320ea8">00139</a>   <span class="keyword">virtual</span> <span class="keywordtype">long</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a885a1ac08d8da3701b6190ab5b320ea8" title="Returns the current number of lines read by this feature extractor from the underlying stream...">line_number</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a01976db120e6528a1bee91051bdf3fc2" title="The number of lines read so far by this feature extractor.">line_number_</a>; }
<a name="l00140"></a>00140 
<a name="l00141"></a>00141  <span class="keyword">protected</span>:
<a name="l00144"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ae2290c8c1b9dc467661285b553a4a6fd">00144</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ae2290c8c1b9dc467661285b553a4a6fd" title="Reads from the stream.">ReadFromStream</a>() {
<a name="l00145"></a>00145     <span class="comment">// TODO(dbikel): Do error checking here for is_-&gt;good().</span>
<a name="l00146"></a>00146     <span class="comment">//               Emit massive warnings when something goes wrong.</span>
<a name="l00147"></a>00147     <span class="comment">// TODO(dbikel): Keep track of number of lines read.</span>
<a name="l00148"></a>00148     <span class="keywordflow">if</span> (<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>-&gt;good()) {
<a name="l00149"></a>00149       getline(*<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>, <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a4149b3cfb999861c3fc3e49ac2a5c7ec" title="The last line read by this feature extractor.">line_</a>);
<a name="l00150"></a>00150       ++<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a01976db120e6528a1bee91051bdf3fc2" title="The number of lines read so far by this feature extractor.">line_number_</a>;
<a name="l00151"></a>00151     } <span class="keywordflow">else</span> {
<a name="l00152"></a>00152       cerr &lt;&lt; <span class="stringliteral">&quot;AbstractFileBackedFeatureExtractor: error: no more input\n&quot;</span>
<a name="l00153"></a>00153            &lt;&lt; <span class="stringliteral">&quot;\t(number of lines read so far: &quot;</span> &lt;&lt; <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a01976db120e6528a1bee91051bdf3fc2" title="The number of lines read so far by this feature extractor.">line_number_</a> &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; endl;
<a name="l00154"></a>00154     }
<a name="l00155"></a>00155   }
<a name="l00156"></a>00156 
<a name="l00157"></a>00157   <span class="comment">// data members</span>
<a name="l00159"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ab1c642c4cc69753a5560aaf9a147750f">00159</a> <span class="comment"></span>  <span class="keywordtype">string</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#ab1c642c4cc69753a5560aaf9a147750f" title="The name of the file backing this feature extractor.">filename_</a>;
<a name="l00161"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8">00161</a>   istream *<a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a2f47865429cf131a257ce11486482de8" title="The stream created from the file backing this feature extractor.">is_</a>;
<a name="l00163"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a4149b3cfb999861c3fc3e49ac2a5c7ec">00163</a>   <span class="keywordtype">string</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a4149b3cfb999861c3fc3e49ac2a5c7ec" title="The last line read by this feature extractor.">line_</a>;
<a name="l00165"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a01976db120e6528a1bee91051bdf3fc2">00165</a>   <span class="keywordtype">long</span> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a01976db120e6528a1bee91051bdf3fc2" title="The number of lines read so far by this feature extractor.">line_number_</a>;
<a name="l00167"></a><a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a23620d92e5fb8e73ca88da6eb65e1447">00167</a>   <a class="code" href="classreranker_1_1_tokenizer.html" title="A very simple tokenizer class.">Tokenizer</a> <a class="code" href="classreranker_1_1_abstract_file_backed_feature_extractor.html#a23620d92e5fb8e73ca88da6eb65e1447" title="A simple whitespace tokenizer for use by concrete subclasses.">tokenizer_</a>;
<a name="l00168"></a>00168 };
<a name="l00169"></a>00169 
<a name="l00170"></a>00170 }  <span class="comment">// namespace reranker</span>
<a name="l00171"></a>00171 
<a name="l00172"></a>00172 <span class="preprocessor">#endif</span>
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